Received-SPF: pass (google.com: domain of linux-kernel+bounces-117314-linux.lists.archive=gmail.com@vger.kernel.org designates 147.75.199.223 as permitted sender) client-ip=147.75.199.223;
From: Baoquan He <bhe@redhat.com>
To: linux-mm@kvack.org
Cc: linux-kernel@vger.kernel.org,
	x86@kernel.org,
	linuxppc-dev@lists.ozlabs.org,
	akpm@linux-foundation.org,
	rppt@kernel.org,
	Baoquan He <bhe@redhat.com>
Subject: [PATCH v2 5/6] mm/mm_init.c: remove unneeded calc_memmap_size()
Date: Mon, 25 Mar 2024 22:56:45 +0800
Message-ID: <20240325145646.1044760-6-bhe@redhat.com>
In-Reply-To: <20240325145646.1044760-1-bhe@redhat.com>
References: <20240325145646.1044760-1-bhe@redhat.com>
Precedence: bulk
MIME-Version: 1.0
Content-type: text/plain
Content-Transfer-Encoding: 8bit

Nobody calls calc_memmap_size() now.

Signed-off-by: Baoquan He <bhe@redhat.com>
---
 mm/mm_init.c | 20 --------------------
 1 file changed, 20 deletions(-)

diff --git a/mm/mm_init.c b/mm/mm_init.c
index 7f71e56e83f3..e269a724f70e 100644
--- a/mm/mm_init.c
+++ b/mm/mm_init.c
@@ -1331,26 +1331,6 @@ static void __init calculate_node_totalpages(struct pglist_data *pgdat,
 	pr_debug("On node %d totalpages: %lu\n", pgdat->node_id, realtotalpages);
 }
 
-static unsigned long __init calc_memmap_size(unsigned long spanned_pages,
-						unsigned long present_pages)
-{
-	unsigned long pages = spanned_pages;
-
-	/*
-	 * Provide a more accurate estimation if there are holes within
-	 * the zone and SPARSEMEM is in use. If there are holes within the
-	 * zone, each populated memory region may cost us one or two extra
-	 * memmap pages due to alignment because memmap pages for each
-	 * populated regions may not be naturally aligned on page boundary.
-	 * So the (present_pages >> 4) heuristic is a tradeoff for that.
-	 */
-	if (spanned_pages > present_pages + (present_pages >> 4) &&
-	    IS_ENABLED(CONFIG_SPARSEMEM))
-		pages = present_pages;
-
-	return PAGE_ALIGN(pages * sizeof(struct page)) >> PAGE_SHIFT;
-}
-
 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 static void pgdat_init_split_queue(struct pglist_data *pgdat)
 {
-- 
2.41.0